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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows provided by operating activities    
Net income $ 3,396 $ 10,569
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 2,896 2,622
Amortization of deferred financing costs 36 36
Benefit for deferred income taxes (1,761) (3,822)
Change in fair value of derivative instruments 1,202 3,398
Other than temporary impairment of marketable securities 177 1,240
Gain on the sale of investments (46) (222)
Stock based compensation 477 477
Losses on disposals of fixed assets 31 115
Noncash interest expense 6 7
Changes in operating assets and liabilities:    
Accounts receivable 4,511 (8,153)
Accounts receivable – related parties (2,251) (2,293)
Inventory 218 (4,950)
Income tax receivable 3,406 1,228
Prepaid expenses 151 106
Prepaid expenses - related party (11)
Accrued interest on marketable securities 13 (30)
Other assets (8) (127)
Accounts payable (5,418) (3,217)
Accounts payable - related parties 371 49
Accrued expenses and other current liabilities 1,385 1,436
Accrued expenses and other current liabilities - related parties (142)
Deferred revenue (451) 2,720
Other noncurrent liabilities 94 8
Net cash provided by operating activities 8,282 1,197
Cash flows from investing activities    
Collateralization of derivative instruments (1,223) (1,349)
Purchase of marketable securities (15,818) (11,000)
Proceeds from the sale of marketable securities 7,884 9,124
Capital expenditures (898) (897)
Net cash used in investing activities (10,055) (4,122)
Cash flows from financing activities    
Minimum tax withholding on stock options exercised and awards vested (53)
Excess tax benefits associated with stock options and awards (136)
Payment of dividends (102,813) (2,623)
Net cash used in financing activities (102,813) (2,812)
Net change in cash and cash equivalents (104,586) (5,737)
Cash and cash equivalents at beginning of period 199,272 154,049
Cash and cash equivalents at end of period 94,686 148,312
Cash paid for interest
Cash paid for income taxes $ 1 $ 906